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Why are emission tests unreliable, yet the testers act like they know it all? One couldn't even find the DLC.

I failed emissions and then circled around and went to a different test stall and passed.

I warmed up the engine and drove a bit prior to getting tested.

I had tested it as well with my 4 gas analyzer and it was within specs.

Also, there was no line so I didn't have to sit and idle at all.

This has happened to me three times in three different vehicles (no fords) in the last 10 years. One was a Chevy sprint, one was a '77 vette L48, one was an Olds Delta 88.

I believe the tests are not accurate or the equipment is miscalibrated, or it's just a money making scheme for the State and Certified Emissions Repair Services.

Also, the last one I took through, ('84 500SEL) failed miserably, Like by 1000%. I threw a tune up and adjusted the timing (which was out 20 degrees) and it ran great so I went for it. This time though, I idled for about 20 minutes while they couldn't input the title data. (this car had never had emissions not required where it came from). Also didn't run it prior.

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  • 1 decade ago
    Favorite Answer

    Anthony: You are a smart guy. Ever notice the Testing Company IS NOT from the state your living in?

    Key word is "Money Making Scheme". I have had to pass Vehicle emissions tests in N.Y., Arizona, Idaho, & Tennessee.

    All Hot Rods. Fail first time, readjusted and was back in 15 minutes. Testing company said How and who made repairs.

    I said myself, and no repair, ADJUSTMENTS. Passed every time on second pass. One time, I had mufflers with outside baffles. The guy didn't know where to take exhaust sample.

    A well tuned stock 1966 Chevrolet Impala with a 2 BBL carb.

    (283 CID ) will STILL pass any test in any state.

    My opinion: Same as yours. Scam!

    Source(s): 40 years hot rod experience, and emission testing.
  • ?
    Lv 4
    4 years ago

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